/*
 * Copyright (C) 2010 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.qrcode.camera;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

import android.graphics.Point;
import android.hardware.Camera;
import android.os.Handler;
import android.os.Message;

final class PreviewCallback implements Camera.PreviewCallback
{
    
    private static final Logger log = Logger.getLogger(PreviewCallback.class);
    
    static
    {
        log.setLevel(Level.OFF);
    }
    
    private final CameraConfigurationManager configManager;
    
    private final boolean useOneShotPreviewCallback;
    
    private Handler previewHandler;
    
    private int previewMessage;
    
    PreviewCallback(CameraConfigurationManager configManager, boolean useOneShotPreviewCallback)
    {
        this.configManager = configManager;
        this.useOneShotPreviewCallback = useOneShotPreviewCallback;
    }
    
    void setHandler(Handler previewHandler, int previewMessage)
    {
        this.previewHandler = previewHandler;
        this.previewMessage = previewMessage;
    }
    
    public void onPreviewFrame(byte[] data, Camera camera)
    {
        Point cameraResolution = configManager.getCameraResolution();
        if (!useOneShotPreviewCallback)
        {
            camera.setPreviewCallback(null);
        }
        if (previewHandler != null)
        {
            Message message =
                previewHandler.obtainMessage(previewMessage, cameraResolution.x, cameraResolution.y, data);
            message.sendToTarget();
            previewHandler = null;
        }
        else
        {
            log.debug("Got preview callback, but no handler for it");
        }
    }
    
}
